Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance
Fractal dimensions (D) of image perimeters of 4 macroalgae (Macrocystis pyrifera, Desmarestia menziesii, Schizoseris condensata, Palmaria georgica) collected at South Georgia, Southern Ocean were established over a wide scale range. For 3 species (M. pyrifera, S. condensata, P. georgica)cross-frond...
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Inter-Research
1996
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Online Access: | http://nora.nerc.ac.uk/id/eprint/515019/ https://doi.org/10.3354/meps136245 |
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ftnerc:oai:nora.nerc.ac.uk:515019 2023-05-15T18:25:33+02:00 Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance Davenport, J. Pugh, P.J.A. McKechnie, J. 1996-06 http://nora.nerc.ac.uk/id/eprint/515019/ https://doi.org/10.3354/meps136245 unknown Inter-Research Davenport, J.; Pugh, P.J.A.; McKechnie, J. 1996 Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance. Marine Ecology Progress Series, 136. 245-255. https://doi.org/10.3354/meps136245 <https://doi.org/10.3354/meps136245> Publication - Article PeerReviewed 1996 ftnerc https://doi.org/10.3354/meps136245 2023-02-04T19:43:48Z Fractal dimensions (D) of image perimeters of 4 macroalgae (Macrocystis pyrifera, Desmarestia menziesii, Schizoseris condensata, Palmaria georgica) collected at South Georgia, Southern Ocean were established over a wide scale range. For 3 species (M. pyrifera, S. condensata, P. georgica)cross-frond D was also estimated. At large scale all species showed complex perimeters (D 1.26 to 1.83, depending on species), but showed reduced complexity (low D) at small scale, and so have mixed fractal characteristics. Cross-frond D was low in the 3 species studied, indicating anisotropy, and was markedly low in P. georgica which has extensive, smooth, flat fronds. Epifaunal community analysis demonstrated that epifaunal abundance and biomass were related more to the scale at which complexity occurs than degree of complexity itself. S.condensata and D. menziesii (particularly complex, high D) show high epifaunal abundance and biomass and a predominance of large animals; M. pyrifera and P. georgica (simpler, lower D) have low abundances and biomasses and the epifauna is dominated by small animals. M. pyrifera is fairly complex (D ca 1.3) at scales above 50 mm; its complexity will impinge on fish, birds and mammals, not epifauna. M. pyrifera beds have a perimeter D (ca 1.4) similar to those of convoluted coastlines. Article in Journal/Newspaper Southern Ocean Natural Environment Research Council: NERC Open Research Archive Southern Ocean Marine Ecology Progress Series 136 245 255 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
Fractal dimensions (D) of image perimeters of 4 macroalgae (Macrocystis pyrifera, Desmarestia menziesii, Schizoseris condensata, Palmaria georgica) collected at South Georgia, Southern Ocean were established over a wide scale range. For 3 species (M. pyrifera, S. condensata, P. georgica)cross-frond D was also estimated. At large scale all species showed complex perimeters (D 1.26 to 1.83, depending on species), but showed reduced complexity (low D) at small scale, and so have mixed fractal characteristics. Cross-frond D was low in the 3 species studied, indicating anisotropy, and was markedly low in P. georgica which has extensive, smooth, flat fronds. Epifaunal community analysis demonstrated that epifaunal abundance and biomass were related more to the scale at which complexity occurs than degree of complexity itself. S.condensata and D. menziesii (particularly complex, high D) show high epifaunal abundance and biomass and a predominance of large animals; M. pyrifera and P. georgica (simpler, lower D) have low abundances and biomasses and the epifauna is dominated by small animals. M. pyrifera is fairly complex (D ca 1.3) at scales above 50 mm; its complexity will impinge on fish, birds and mammals, not epifauna. M. pyrifera beds have a perimeter D (ca 1.4) similar to those of convoluted coastlines. |
format |
Article in Journal/Newspaper |
author |
Davenport, J. Pugh, P.J.A. McKechnie, J. |
spellingShingle |
Davenport, J. Pugh, P.J.A. McKechnie, J. Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance |
author_facet |
Davenport, J. Pugh, P.J.A. McKechnie, J. |
author_sort |
Davenport, J. |
title |
Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance |
title_short |
Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance |
title_full |
Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance |
title_fullStr |
Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance |
title_full_unstemmed |
Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance |
title_sort |
mixed fractals and anisotropy in subantarctic marine macroalgae from south georgia:implications for epifaunal biomass and abundance |
publisher |
Inter-Research |
publishDate |
1996 |
url |
http://nora.nerc.ac.uk/id/eprint/515019/ https://doi.org/10.3354/meps136245 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Davenport, J.; Pugh, P.J.A.; McKechnie, J. 1996 Mixed fractals and anisotropy in subantarctic marine macroalgae from South Georgia:implications for epifaunal biomass and abundance. Marine Ecology Progress Series, 136. 245-255. https://doi.org/10.3354/meps136245 <https://doi.org/10.3354/meps136245> |
op_doi |
https://doi.org/10.3354/meps136245 |
container_title |
Marine Ecology Progress Series |
container_volume |
136 |
container_start_page |
245 |
op_container_end_page |
255 |
_version_ |
1766207092998275072 |